Connectionless Delivery
Connectionless delivery services allow you to send a message to another node without previously
establishing a logical connection to the other node. TCP/IP provides a format known as the USER
DATAGRAM PROTOCOL (UDP) for sending and receiving connectionless messages. Connectionless
delivery is simple to implement and consumes a small amount of system resources. However,
delivery of UDP messages is not confirmed by the network protocol. It is left to higher level
protocols to acknowledge receipt of a message. Since the Common ASCII Message Protocol (CAMP)
used with the 2572 will acknowledge receipt of a command message, UDP is the preferred protocol
for most applications, such as process monitoring, which obtain data from the PLC.

The 2500 Series® Compact Controllers bring exciting new features and a new level of
process performance to CTI’s 2500 Series® Control Systems. The Compact Controller
easily handles small to large discrete and process applications.
Compact processors have the same features and performance as our Classic processors,
and include PID loops, alarms and special mathematical functions to make them perfect
for process applications.
TCP/IP Overview
The CTI 2572 module uses TCP/IP (Transmission Control Protocol/Internet Protocol) to transport
messages between the module and other nodes on the network. TCP/IP is a suite of protocols that
provide routing and delivery services for messages between application programs running on
different processors (called hosts in TCP/IP terminology). You may select between connectionless
(packet based) or connection-oriented (stream based) delivery services.
CTI 2577 - Profibus DP Slave Adapter
CTI 2581 - 16-point Isolated 12-56 VDC Input Module
CTI 2585 - 16-point TTL/Word Input Module
CTI 2588-8 - 8-point Universal Input Module
CTI 2589-B - 8/16/32-point Universal Input Module
CTI 2590-A - 16-point Isolated 20-132 VAC Output
CTI 2590-EF / 2591-EF 16-Point Isolated Discrete Output Modules
CTI 2591-A - 16-point Isolated 11-146 VDC Output
CTI 2591-EF - 16-point Isolated 11-146 VDC Output w/ front panel accessible fuses
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